eating gas rough idle missing when cold


rottonrattt
02-28-2010, 01:27 AM
i don't know whats wrong with my car its acting funny erratic idle

rottonrattt
02-28-2010, 10:24 PM
i was just wondering if somone knows how to check a intake and plenum for air leaks????i just got my car out the shop it runs faily well but it idles a little high and has a bit of a radom putt in it.idles at 1200 cold and 1000 hot please help me thax!!:iceslolan

AutostradaVR4
03-01-2010, 10:27 AM
Irradic Idle is probably your IAC. DSMISC.com is the cheapest place to get them.

if your timing was a little off it wouls run crappy. If it was more than a little off you would bend valves.

EDITED. the site is DSMISC.com...

AutostradaVR4
03-01-2010, 10:29 AM
what did u have done at the shop? could be you need a new plenum gasket, could be you just need to dial down the idle a bit, yould be you need to loosen the throttle cable.

rottonrattt
03-01-2010, 10:50 AM
i jad the engine replaced had timming belt water pump rear seal and plugs .how do you adjust the idle ??

press1 for English
03-01-2010, 10:54 AM
"If it was more than a little off you would bend valves."???

You can not bend valves with incorrect ignition timing.

rottonrattt
03-01-2010, 10:55 AM
oh yeah the engine was in a automatic they had to change the fly wheel maybe thats my problem i think autos might idle higher.am i right?

AutostradaVR4
03-01-2010, 11:32 AM
whole engine replaced?! well, could be a lot of things..start with the easiest.
There's 2 bolts on the back of the plenum that hold the throttle cable. Loosen it and push it all the way towards the throttlebody, then see what your idle's at. (make sure it's fully warmed up) if that fixes it, you know that was the problem. That bracket should be adjusted loose enough so that it's not putting any tension on the throttle cable...but tight enough so the cable doesn;t have alot of slack. Try this first then let us know.

warm Idle should be around 600-800, regaurdless of transmission. flywheel wont make a difference either.

AutostradaVR4
03-01-2010, 11:40 AM
"If it was more than a little off you would bend valves."???

You can not bend valves with incorrect ignition timing.

he said nothing of ignition timing, so im assuming he talking about the timing belt, with WILL bend valves if it's off by more than a few teeth. Valve, meet Piston; Valve loses.

rottonrattt
03-01-2010, 12:15 PM
ok tried it it the about the same it at 900 rpm i also tried to adjust the idle cntrol scew i tightened it all the way down and it seems like it readjusted back to 900

rottonrattt
03-01-2010, 12:16 PM
also i do have a strange noise coming from the driver side i just checked this noise and i think it is th ac condenser (pump) when i turn the ac on the thing way making i real high pitch squeal

rottonrattt
03-01-2010, 12:24 PM
and yes i was saying if it was off by a tooth or off by alot i had timing belt replaced and i just wanted to know if the shop had it on right i have a random popping noise out exhaust at idle and a asmall puff of smoke its not real thick or dark though!!

toddrs93
03-01-2010, 01:25 PM
and yes i was saying if it was off by a tooth or off by alot i had timing belt replaced and i just wanted to know if the shop had it on right i have a random popping noise out exhaust at idle and a asmall puff of smoke its not real thick or dark though!!
that also sounds like a misfire or wrong firing order (plug wires crossed), if its a fairly loud noise

Stealthee
03-01-2010, 05:46 PM
Irradic Idle is probably your IAC. DSMISC.com is the cheapest place to get them.

if your timing was a little off it wouls run crappy. If it was more than a little off you would bend valves.

EDITED. the site is DSMISC.com...
Rock Auto is cheaper than DSMISC. They have them there for $70.

rottonrattt
03-01-2010, 06:49 PM
could it be a fuel problem? the car sat for 6 month in storage before i cou;d afford to get her fixed iv only put like 3 gallons of new fuel since i got it out the shop i did put fuel injector cleaner in it.do you think this could cause it to do this??

rottonrattt
03-03-2010, 07:58 PM
i cleaned my idle control valve and now my car is cuting off when i change gears
it will idle if i hold it at 1000rpms for about 30 seconds and let off the gas and then if i try to drive it it does the same thing again.is ther a way to fix my icv what did i do wrong??

rottonrattt
03-03-2010, 08:06 PM
oh yeh i used air intake cleaner

danielsatur
03-03-2010, 08:09 PM
It's getting no air!

rottonrattt
03-03-2010, 08:18 PM
i ordered a new one but if any one know what i did wrong and can tell me how to fix it i will call and cacel the order.

91STT
03-04-2010, 04:07 PM
make sure you reconnected all of the plumbing securely.
you may have left a vacuum line off and unmetered air is causing your problems.

rottonrattt
03-05-2010, 11:44 PM
eating gas rough idle missing when cold
my 3000gt is eating gas ,has hesitation when cold,iregular idle does this sound like a fuel problem?i just changed my idle control module today did not fix problem

AutostradaVR4
03-06-2010, 11:17 AM
how many miles on the plugs?

rottonrattt
03-06-2010, 12:40 PM
just changed

Stealthee
03-06-2010, 01:37 PM
I appreciate your enthusiasm to posting here but please do not make a new thread every day when there are currently several of yours open pertaining to the same problem. It clutters the board.

rottonrattt
03-06-2010, 08:38 PM
i want to delete all the others post but i dont know how ! if you can tell me how i will delete them.thax

Stealthee
03-06-2010, 08:48 PM
I will go through and delete them for you. I can do a mass delete so you don't have to delete one at a time.

For now on though all you have to do is go to the first post and click edit. Click delete post. Deleting the first post will delete the thread.

Instead of deleting I merged all threads into this one. It may be a bit confusing at the top but all the info is still there.

Stealthee
03-06-2010, 08:53 PM
"If it was more than a little off you would bend valves."???

You can not bend valves with incorrect ignition timing.
I cant beleive I didnt see this before. He was asking about CAM timing. Yes you can bend valves with incorrect cam timing.

rottonrattt
03-06-2010, 09:13 PM
cool man thax!

rottonrattt
03-08-2010, 01:35 AM
i just changed my wires its running better but i woukd like to know is it normal for it not to run extremly stead?this is my first 3000gt ihve owned a lot of other cars but never a mitsu!its still a tad choppy

rottonrattt
03-08-2010, 02:57 AM
oh yeah also does any one know if there is a independent heat sensor for th ecu?
someone told me this was possibly why i lack power when cold.and i cant find the damn thing lol

rottonrattt
03-17-2010, 06:06 PM
:banghead:I have a 95 3000gt 6g72 non turbo dohc i had the motor replaced three weeks ago water pump,timing belt ,plugs,wires,ecu temp gauge ,coils,top vacuum lines excluding purge container lines, plenum gasket,stepper motor.also took to a shop for a standard diagnostic and they could not find any flaw in the running condition.but i have a slightly rough idle with no lights also when start it when cold it goes to 2500rpms for about 2 minutes before coming down to around 1000rp-800 rpms its a steady idle speed with a sputter .also if driven while cold it act's like it doesn't want to really go almost like it wants to stall or something without doing so!but when hot drive fine little power loss if any just the funny idle!please help!!thax in advance

toddrs93
03-19-2010, 12:41 AM
:banghead:I have a 95 3000gt 6g72 non turbo dohc i had the motor replaced three weeks ago water pump,timing belt ,plugs,wires,ecu temp gauge ,coils,top vacuum lines excluding purge container lines, plenum gasket,stepper motor.also took to a shop for a standard diagnostic and they could not find any flaw in the running condition.but i have a slightly rough idle with no lights also when start it when cold it goes to 2500rpms for about 2 minutes before coming down to around 1000rp-800 rpms its a steady idle speed with a sputter .also if driven while cold it act's like it doesn't want to really go almost like it wants to stall or something without doing so!but when hot drive fine little power loss if any just the funny idle!please help!!thax in advance

maybe coolant temp sensor or idle speed motor, do you know if this is a california emissions spec vehicle? If so it will have extra pre-catalytic converters after the exhaust manifolds that sometimes cause problems. Honestly I have had several like that and sometimes its nearly impossible to find the problem, if it runs ok as soon as it warms up just let it run a few minutes before you drive it.

rottonrattt
03-19-2010, 12:49 AM
i pulled the cam cover off lined up the marks and the lowwer pully is on 10 is that correct?

rottonrattt
03-19-2010, 01:36 AM
1995 3000gt i pulled of the cam cover and put my car in reverse and lined up the marks and the harmonic balancer was at 10 is this correct timming?

Stealthee
03-19-2010, 06:07 AM
That 10 is for ignition timing. That has nothing to do with cam timing.

Again, please stop making multiple threads. Keep all the info in the one merged thread.

hollydolly
02-04-2016, 08:13 PM
Mine started idle reving when im stopped it will rev 1-3rpm continusly by itself.any ideas as to a cause

hollydolly
02-09-2016, 11:44 PM
Mine started idle reving when im stopped it will rev 1-3rpm continusly by itself.any ideas as to a cause

bought a can of mass flow cleaner got home and reading the back of the can it says don't use it on Karman Vortex mass air flow sensors. the examples listed include mitisubushi. So does my car have the Karman Vortex mass air flow sensor? how do I tell?

Stealthee
02-10-2016, 06:05 AM
Yes the 3000GT uses a Karman MAS

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